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Hybrid vehicle and control method for same

a hybrid vehicle and control method technology, applied in hybrid vehicles, process and machine control, instruments, etc., can solve the problems of limited reduction of internal combustion engine rotation speed, limited execution of rotation speed increase control, etc., and achieve the effect of improving driving ability

Inactive Publication Date: 2019-06-18
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a control method for a hybrid vehicle that limits the increase in rotational speed of its internal combustion engine during charging. This limits the amount of power that can be supplemented by the electric power storage device, increasing the likelihood of ensuring the vehicle's power demand is met. Overall, this method improves the ability of the hybrid vehicle to maintain sufficient power output during charging and optimizes its performance.

Problems solved by technology

In the control method, the execution of the rotation speed increase control is limited in a charge depleting mode compared to a charge sustaining mode.
According to the hybrid vehicle having the configuration described above and the control method for the hybrid vehicle, the execution of the rotation speed increase control is limited in the charge depleting mode compared to the charge sustaining mode.
Accordingly, a reduction in the rotation speed of the internal combustion engine is limited in the charge depleting mode, and thus a situation is unlikely to occur in which a shortfall of output power from the internal combustion engine is supplemented by using discharging electric power from the electric power storage device.

Method used

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  • Hybrid vehicle and control method for same

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Experimental program
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first embodiment

[0079]FIG. 6 is a flowchart for showing the rotation speed increase control according to the Referring to FIG. 6, this flowchart is called from a main routine and executed when a predetermined condition is satisfied or whenever a predetermined period of time elapses. Basically, each of the Steps in this flowchart is realized by software processing by the ECU 300. Each of the Steps in this flowchart may also be realized by hardware (electronic circuit) manufactured in the ECU 300.

[0080]In Step (hereinafter, simply referred to as S) 10, the ECU 300 determines whether or not an engine start request is present (or whether or not the engine 100 is already in a driving state). More specifically, the ECU 300 determines whether or not the engine start request is present based on whether or not the vehicle power demand exceeds a predetermined start threshold. In a case where the engine start request is present or in a case where the engine 100 is in the driving state (YES in S10), the proce...

second embodiment

[0088]FIG. 7 is a flowchart for showing rotation speed increase control according to the Referring to FIG. 7, this flowchart is different from the flowchart that is illustrated in FIG. 6 in that the processing of S42 is executed instead of the prohibition of the rotation speed increase control (refer to S40 in FIG. 6). The processing other than S42 is identical to the corresponding processing in the flowchart that is illustrated in FIG. 6, and thus detailed description thereof will not be repeated.

[0089]In S42, the rotation speed increase control is executed even in the CD mode. Still, the decrement in the engine rotation speed Ne is set to be less than in the CS mode.

[0090]If the execution of the rotation speed increase control is prohibited in the CD mode as in the first embodiment, drivability relating to the sense of acceleration cannot be improved in the CD mode. However, if the discharging electric power does not reach the discharging electric power upper limit value Wout eve...

third embodiment

[0096] the execution of the rotation speed increase control is prohibited, regardless of the traveling mode, in a case where the discharging from the battery 150 is increasingly limited in accordance with the battery temperature TB or the SOC and the discharging electric power upper limit value Wout is exceeded by a predetermined value. A maximum value WO is used as an example of the predetermined value. Still, the predetermined value is not limited thereto. The predetermined value can be appropriately determined in accordance with the configuration of the vehicle 1 (for example, the characteristic of the discharging electric power upper limit value Wout of the battery 150).

[0097]FIG. 10 is a flowchart for showing the rotation speed increase control according to the third embodiment. Referring to FIG. 10, this flowchart is different from the flowchart that is illustrated in FIG. 6 in that the processing of S12 is further provided. Description of the Steps common to FIG. 6 will not b...

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Abstract

A vehicle is provided with an engine, a battery, a second motor generator generating a driving force by using electric power of the battery, and an electronic control unit (ECU) controlling the engine and the second motor generator. The ECU is configured to be capable of executing rotation speed increase control for controlling the rotation speed of the engine so that the sound pressure of the engine is increased in response to an increase in the vehicle speed of the vehicle. In a charge depleting (CD) mode in which the state of charge (SOC) of the battery is consumed, the ECU limits the execution of the rotation speed increase control compared to a charge sustaining (CS) mode in which the SOC is maintained in a predetermined range.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a national phase application of International Application No. PCT / IB2015 / 000595, filed Apr. 30, 2015, and claims the priority of Japanese Application No. 2014-110115, filed May 28, 2014, the content of both of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a hybrid vehicle and a control method for the same and, more particularly, a hybrid vehicle that is configured to be capable of executing rotation speed increase control for controlling the rotation speed of an internal combustion engine so that the sound pressure of the internal combustion engine is increased in response to an increase in the vehicle speed, and a control method for the same.[0004]2. Description of Related Art[0005]Engine sound pressure is known as a factor that gives a driver a sense of acceleration during the acceleration of a vehicle. If, engine sound pressure corr...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B60L9/00G05D1/00G05D3/00G06F7/00G06F17/00B60K6/445B60W10/06B60W20/40B60W10/30B60W20/15B60W10/08B60K6/46B60L50/16
CPCB60W20/40B60K6/445B60W10/06B60W10/08B60W10/30B60W20/15B60K6/46B60W2710/0644B60Y2200/92B60Y2300/194B60Y2300/91Y02T10/6239Y02T10/6269Y02T10/6286Y10S903/905Y02T10/62B60K6/24B60K6/26B60K6/28
Inventor ENDO, HIROKIHOKOI, KOJI
Owner TOYOTA JIDOSHA KK
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